Сільвестер

Younger half-brother: Ferdinand

Paternal relatives 　 Uncle: Bonifatius 　　　 Cousin: Karstedt 　　　 Cousin: Karstedt's half-brother 　 Half-aunt: Irmhilde

Maternal relatives 　 Grandmother: Gabriele 　 Uncle: Bezewanst (not baptized as a noble) 　 Grandfather: Giebe Groschel (first generation) 　 Half-aunt: Elvira's mother 　　　 Cousin: Claudio 　　　 Cousin: Elvira 　 Half-uncle: Giebe Groschel (second generation) 　　　 Cousin: Giebe Groschel (third generation)

Status 　Class: archduke 　 Occupation: aub ehrenfest

Age related 　Grade difference with Rozemyne: +19 　 Birth season: spring

He's introduced as a blue priest. He has strong bluish purple hair and dark green eyes. Ferdinand describes him as a man with a terrible personality, but with a kind heart underneath everything else rotten. Later is revealed that he is the Archduke of Ehrenfest (seventh generation).